Tuesday May 16, 2017FILE - U.S. President Donald Trump meets with Russian Foreign Minister Sergey Lavrov, left, next to Russian Ambassador to the U.S. Sergei Kislyak at the White House in Washington, May 10, 2017. (Russian Foreign Ministry photo via AP)

WHITE HOUSE — U.S. National Security Adviser H.R. McMaster and other members of the Trump administration have denied the accuracy of published reports that the president revealed highly classified information to Russian officials in the Oval Office.

The original story, first reported by the Washington Post, "is false," McMaster told reporters on the White House grounds late Monday. "At no time were intelligence sources or methods discussed and the president did not disclose any military operation that was not already publicly known," he added.

"I was there. It didn't happen," McMaster concluded, then turned around and re-entered the West Wing without answering reporters' questions.

Tillerson backs up McMasters

Secretary of State Rex Tillerson, who said he also attended the May 10 meeting with the Russian foreign minister and Russian ambassador, backed up McMaster's characterization of the conversation, adding in a statement that "a broad range of subjects were discussed, among which were common efforts and threats regarding counterterrorism."

Several U.S. news organizations reported that the president, in the Oval Office meeting with Russian Foreign Minister Sergey Lavrov and Ambassador Sergey Kislyak, disclosed information considered highly classified.

Trump appeared to be boasting about inside knowledge of a looming threat to aviation, according to the Washington Post.

The New York Times reported that the information, which was deemed to be especially sensitive, had not even been shared widely within the U.S. government or shared with other allies.

The two newspapers, and others, further said the information could jeopardize a critical source of intelligence about Islamic State and the manner in which it was collected.

A U.S. president has the power to declassify nearly any information, so what Trump did does not appear to be illegal. But intelligence officials, quoted by the newspapers, expressed concern that the information, provided by a U.S. partner government, could harm crucial relationships.

The Central Intelligence Agency and National Security Agency declined immediate comment when contacted by VOA.

Since the early days of the Trump administration, the president’s apparent willingness to work with Russia had some U.S. allies ill at ease.

"It's a key concern," a Western diplomatic official who spoke on condition of anonymity told VOA at the time. "Russia has been a very disruptive player."

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But some former intelligence officials think the repercussions from the Oval Office meeting will be minimal, if any.

“No damage - no sources or methods revealed,” said Michael Pregent, a former intelligence officer now with the Hudson Institute, a Washington think tank.

Pregent, who worked with McMaster in Iraq, said it is unlikely the national security adviser would have allowed the president to cross any lines.

Instead, Pregent sees an opportunity to have turned the Russian visit to the White House to Washington’s advantage.

“Sharing this info with the Russians calls them on their inaction against ISIS in Syria,” he said.

Alarm from Capitol Hill

Monday's reports prompted immediate bipartisan alarm on Capitol Hill.

"I am shocked by reports that President Trump revealed highly classified information to Russian diplomats last week. This certainly raises questions about whether the president recognizes the serious implications of disclosing such sensitive information to an adversary," said

Democratic Representative Eliot Engel, the ranking member on the House Committee on Foreign Affairs. "I will be meeting later this week with National Security Adviser McMaster in a classified session, and will seek answers about what was revealed and how it could damage American national security."'Inexcusable'

The vice chairman of the Senate Select Committee on Intelligence, Democrat Mark Warner, said on Twitter that "risking sources and methods is inexcusable, particularly with the Russians."

Trump's comments, if true, are a "slap in the face" to the U.S. intelligence community, Warner added.

"The White House has got to do something soon to bring itself under control and in order," the chairman of the Senate Foreign Relations Committee, Republican Bob Corker, told reporters. "Obviously they're in a downward spiral right now and they have to figure out ways to come to grips with all that's happening."

The story broke as the White House remains embroiled in controversy over last week's firing by the president of FBI Director James Comey. That occurred one day prior to the Oval Office meeting with the Russians.

FBI probe looks at link

The FBI is investigating alleged links between Trump's 2016 presidential campaign and Russia.

In a joint statement, the top Democrats on the House Oversight and Government Reform Committee and the House Judiciary Committee, Elijah Cumming and John Conyers, called for the release of any audio recordings of Trump's meeting last week with the Russians.

"After an unprecedented week in which many thought it would be impossible for President Trump to be any more irresponsible, he now may have sunk to a dangerous new low," the two Democrats concluded.